The relationship between first, second and third ionisation enthalpies of each group-13 element is
(a) \( \Delta_{\mathrm{i}} \mathrm{H}_{1}\Delta_{\mathrm{i}} \mathrm{H}_{2}\Delta_{\mathrm{i}} \mathrm{H}_{3} \)
(b) \( \Delta_{\mathrm{i}} \mathrm{H}_{1}\Delta_{\mathrm{i}} \mathrm{H}_{2}\Delta_{\mathrm{i}} \mathrm{H}_{3} \)
(c) \( \Delta_{\mathrm{i}} \mathrm{H}_{1}=\Delta_{\mathrm{i}} \mathrm{H}_{2}\Delta_{\mathrm{i}} \mathrm{H}_{3} \)
(d) \( \Delta_{\mathrm{i}} \mathrm{H}_{3}\Delta_{\mathrm{i}} \mathrm{H}_{1}\Delta_{\mathrm{i}} \mathrm{H}_{2} \)
W
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